AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-12-01 17:30:07 +00:00
Code Issues Packages Projects Releases Wiki Activity
caed4e98ca
glibc/sysdeps/powerpc/sys/platform/ppc.h

54 lines
1.7 KiB
C
Raw Normal View History

Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
/* Facilities specific to the PowerPC architecture
Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _SYS_PLATFORM_PPC_H
#define _SYS_PLATFORM_PPC_H 1
Direct __ppc_get_timebase to __builtin_ppc_get_timebase for GCC 4.8+. Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides __builtin_ppc_get_timebase. Building applicationns with previous versions of GCC will continue to use the internal implementation.
2012-11-02 16:20:39 +00:00
#include <features.h>
Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
#include <stdint.h>
Add __ppc_get_timebase_freq to ppc.h.
2012-09-25 19:48:28 +00:00
#include <bits/ppc.h>
Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
/* Read the Time Base Register. */
static inline uint64_t
__ppc_get_timebase (void)
{
Direct __ppc_get_timebase to __builtin_ppc_get_timebase for GCC 4.8+. Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides __builtin_ppc_get_timebase. Building applicationns with previous versions of GCC will continue to use the internal implementation.
2012-11-02 16:20:39 +00:00
#if __GNUC_PREREQ (4, 8)
return __builtin_ppc_get_timebase ();
#else
# ifdef __powerpc64__
Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
uint64_t __tb;
/* "volatile" is necessary here, because the user expects this assembly
isn't moved after an optimization. */
__asm__ volatile ("mfspr %0, 268" : "=r" (__tb));
return __tb;
Direct __ppc_get_timebase to __builtin_ppc_get_timebase for GCC 4.8+. Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides __builtin_ppc_get_timebase. Building applicationns with previous versions of GCC will continue to use the internal implementation.
2012-11-02 16:20:39 +00:00
# else /* not __powerpc64__ */
Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
uint32_t __tbu, __tbl, __tmp; \
__asm__ volatile ("0:\n\t"
"mftbu %0\n\t"
"mftbl %1\n\t"
"mftbu %2\n\t"
"cmpw %0, %2\n\t"
"bne- 0b"
: "=r" (__tbu), "=r" (__tbl), "=r" (__tmp));
return (((uint64_t) __tbu << 32) | __tbl);
Direct __ppc_get_timebase to __builtin_ppc_get_timebase for GCC 4.8+. Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides __builtin_ppc_get_timebase. Building applicationns with previous versions of GCC will continue to use the internal implementation.
2012-11-02 16:20:39 +00:00
# endif /* not __powerpc64__ */
#endif
Manual for platform-specific features and new __ppc_get_timebase inline. [BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
2012-06-04 18:46:37 +00:00
}
#endif /* sys/platform/ppc.h */
Reference in New Issue Copy Permalink